Warning: [mysql error 145] Table './piwigo/piwigo_user_feed' is marked as crashed and should be repaired

SELECT COUNT(*)
  FROM piwigo_user_feed
  WHERE id = 'KFnyX9wQVSCs7dCY5EGy6qhkVCVjAdR17oN0aynjf6hvTNWTwH'
; in /home/piwigo/public_html/piwigo-2.6.4/piwigo/include/dblayer/functions_mysqli.inc.php on line 798

Fatal error: Call to a member function fetch_row() on a non-object in /home/piwigo/public_html/piwigo-2.6.4/piwigo/include/dblayer/functions_mysqli.inc.php on line 186